HollywoodLife.com has learned EXCLUSIVELY that Charlie Sheen and Brooke Mueller’s huge Christmas Eve blow-out had everything to do with Brooke allegedly returning to some of her past substance abuse habits.

HollywoodLife.com has learned EXCLUSIVELY that Charlie Sheen and Brooke Mueller‘s huge Christmas Eve blow-out had everything to do with Brooke returning to some of her past substance abuse habits. Despite reports that the fight ignited over a song written for Charlie’s daughter or the fact that the couple had been drinking, a source close to the couple tells us the fight was about Brooke — and a substance abuse problem that had allegedly re-emerged recently. On Jan. 27, Brooke reportedly checked into the Two Dreams Outer Banks rehab center in North Carolina, after a stint in the hospital due to pneumonia. According to RadarOnline.com, Brooke “is in rehab for both drugs AND alcohol. Her lifestyle was so out of control that friends tried to bring her drugs while she was hospitalized during the past several days.” Read more